Ah, a naughty tortie - I used to have one of those! She will keep you wonderfully entertained, and occasionally exasperated!
I have two indoor cats - we have a garden which they have access to but only when we're there so most of the time - during the week and all through the winter - they don't go out.
I can recommend investing in a cat tree because cats love to be able to climb up on different levels. Also, a good selection of toys. You don't have to spend a fortune, often they'll be happy with a paper bag or a piece of cardboard or a box they can rip up or jump inside. And if Daisy doesn't go out at all, bring in things you find outside for her to smell and investigate. Feathers, rocks from the garden, that sort of thing. Try growing her some indoor grass - most pet shops sell this specifically for cats. It's good for their digestion and gives them a bit of variety.
And don't forget catnip!